合金元素Cr和V对Ti-45Al-8Nb合金定向凝固组织的影响.doc

文档介绍：
合金元素 Cr 和 V 对 Ti-45Al-8Nb 合金定向
凝固组织的影响#
陈锋,周玉俊,彭英博,周雪峰,李沛,刘开,陈光**
5
10
(南京理工大学材料设计与评价教育部工程研究中心)
摘要: 采用 Bridgman 方法对 Ti-45Al-8Nb , Ti-45Al-8Nb- , Ti-45Al-8Nb- ,
Ti-45Al-8Nb-- 4 个合金进行定向凝固实验,四个合金均得到片层取向与生长方向
呈 45°的单晶,结果表明 Cr 和 V 的复合添加有助于快速得到稳定的 PST 晶体。Cr 和 V 对片
层组织均有细化作用,其中 Ti-45Al-8Nb-- 平均片层间距仅为 Ti-45Al-8Nb 合金的
53%。Cr 和 V 偏聚于γ片层中,并促使α2 相中 Al 含量的提高。合金元素的添加对合金的
硬度产生不利影响。
关键词:金属材料;高 Nb-TiAl 合金;定向凝固;合金元素;片层间距;硬度
中图分类号:TG
15
EFFECT OF Cr AND V ADDITION ON THE
DIRECTIONAL SOLIDIFITION MICROSTRUCTURE
OF Ti-45Al-8Nb ALLOY
CHEN Feng, ZHOU Yujun, PENG Yingbo, ZHOU Xuefeng, LI Pei, LIU Kai, CHEN
20
25
30
Guang
(Engineering Research Center of Materials Behavior and Design Minstray of Education, Nanjing
University of Science and Technology)
Abstract: In this paper,the directional solidification of Ti-45Al-8Nb , Ti-45Al-8Nb- ,
Ti-45Al-8Nb- and Ti-45Al-8Nb-- alloys were carried out through Bridgman method.
The results shows that all of the four alloys obtained single crystal with the angle of lamellar
orientation and growth direction being 45°, and the Ti-45Al-8Nb-- alloy obtains the single
crystal fastest. Both Cr and V can refine the lamellar microstructure, and the average lamellar spacing
of the Ti-45Al-8Nb-- alloy is only 53% of that of the Ti-45Al-8Nb alloy. Cr and V are only
found in